Sound amplifier



E. H. ROLLlNSON SOUND AMPLIFIER Dec;A 7, 1926.

Filed June 24. 1925 Patented Der. 7, 1.925.

SOUND AMPLIIEER.

Application led''une 24, 1225. Serial No. 33.295.

This invention krelates to sound amplifyers in which diaphragms are caused to vibrate by electro-magnetic or mechanical instrumentalities, and particularly to such de- I vices as are used in connection with radio apparatus.

One object of the invention is to provide an ornamental support base of insulate material to which a horn may be att-ached, the base having` a chamber to contain a telephone receiver unit of approved type.

A further feature is in the provision of a pair of diaphragme arranged in operative relation within the base and means whereby the diaphragme may be mutually adjusted therein to present an unusually agreeable resonant effect. which may be modulated to produce a variation in pitch. l

Another aim is to provide a novel type of 20 diaphragm Vcontactor.y reversibly mounted and having' peculiar properties in connection with a companion diaphragm tending to aufrment and clarify the high or low pitched sounds emanating' from the unit. l g Y These and vother relevant features are achieved by the present design and arrangement of elements hereinafter described and displayed in the associated illustrations. a constituent of this disclosure, and in whicli`:--4

Figure 1 is a transverse sectional view of an amplifier support made in accordance with the invention. the section being taken on line 1-'1 of Figure 2.

Figure 2 is a bottom plan view of the same. the base member being' omitted.

Fieure 3 is a top plan view thereof.

Figure *A is a similar transverse sectional view showing a modified form of diaphragm contact. v

Figure 5 is an enlarged fragmentary sectional rview of the contactor as attached to the upper diaphragm.

The body of the support is made of dielectric material. preferably that commercially known as balrelite. by molding? in highly finished dies to produce a smooth surface. having the appearance of a polish finish.

In the upper contracted end of the body is an opening 11 leading to a chamber 12, and fitted to rotate in the opening is an annular flange 13 extending from a cap 14,.

having anV imperforate cover portion 15, from which rises a central hub 16 reenforced by ribs 17.

rEhe tapered portion of a conventional type of horn 18 is provided with a stop collar 19 to rest on the hub 16, and the straight cylindrical end 2O of the horn is closely fitted to the hub opening to entend level with the lower surface of the cover element 15., above the space 21 in the cap.

Fixed to the annularly shouldered portion 14e of the cap is a thin fiat ring 22 extending: G5

utwardly over the upper portion of the body.y and carrying a series of graduations 253 arranged in decimal sequence'relative to an index mark 24 on the margin of the body.

as can best be seen in Figure 8.

The inner surface of the cap flange 13 is screw-threaded and engaged therein is the iiange 25 of a cup 26 containing` the mag.'- nets 2'? of a telephone receiver unit. to which current is connected by conductors/28 in the 75 cable 29.

rlhe magnets 27 are adapted to actuate a metallic diaphragm 3() set in the cup 26 at its upper open edge and the cup fiance 25 is provided with a plurality of Yopenings 31 communicating' with the chamber 12 and cap space 21. J

A pair of screws 32 have their threaded portions engaged in the under side of the upper portion of the body 12, the heads of the screws seating against the outer surface of an elongated rectangular bar 33, disposed transversely in the lower part of the body chamber 12 and held in fixed relation in the body 10 by spacing sleeves 34 encircling the bodies of the screws.

A second pair of screws 35 are threaded into the cup flange 25 to extend through the bar 83, their heads being provided with washers 36 on which abut encircling compression springs 37, seated on the outer sur face of the bar, the effect beingto constantly draw the cup towards the bar and permit of its being adjusted.

A cushioned sub-base 38, of cup shaped design is secured to the body 10 by a clamp screw 39 threaded into the bar 33, this base closing the entrance to the body chamber 12 and providing` room for thel heads of the screws 35.

In the cap space 21 is disposed an inverted conical paper diaphragm AO, its base being seated against the lower surface of the cap element 15 and its apex7 central of the horn 18. in proximity to the metal diaphragm 30.

it will be understood that by rotating the cap or ring dial, constituted by the elements 13 to 17 and 22, the cup 26 and diaphragm 30 carried by it, constituting part of the telephone receiver unit, will be moved towards or from the ring dial and cone diaplniagn'i,y causing the sounds produced to vary in pitch from the highest to the lowest obtainable.

This rotation of the ring dialY is easily accomplished, due to the raised ribsy 17 and is accurately determined by the graduations 9.3 on the dial, it being noticeable that the dial at all timesI remains seated on the body, while the telephone receiver unit is held from rotation by the screws 35, but is per- 2 mitted to move up and down within the body, being guided by the screws.

In the modification shown in Figures 1l and 5, at the c-iter of' the diaphragm 40 is a bloclr stl having screw threaded stem i-2 passing througli the diaphragm and engag ing in an axial opening in a similar block 43 on its opposite side.

Each of these blocks are cupped at their outer projecting endsto receive contactors, here shown as metal spheres 44, secured by crimping the edges ofthe cupped recesses to hold them in place.

From thefforegoing it will be seen that the spherical contactors are reversible to bring either to bear against the diaphragm 30, and that the cup Q6 with the diaphragm 30 may be adjusted towards or from the contactor carrying diaphragm 40 to produce variations in tone.

Vhile certain preferred embodiments of this device have been shown and described, it will be understood that changes in the form, arrangements, proportions, sizes rand details thereof may be made without departing from the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is z- 1. A sound ampliiier comprising a hollow support, a dial carrying cap revoluble on said support, said cap having means to engage a horn, a telephone receiver unit in said support, said unit including a diaphragm, a diaphragm carried in said cap, and means to adjust the distance between said diaphragms.

2. A sound amplifier comprising a hollow support, a dial carrying cap revoluble on said support, said cap having means to enu a horn, a telephone receiver unit in said support, said unit including a diaphragm, a conical diaphragm in said cap having its apex adjacent the diaphragm of said unit, ano means for adjusting said unit relative to the conical diaphragm.

3. A sound amplitier comprising a hollow dielectric support.y a cap provided with a dial rotatably engaged on said support, resilient means for retaining said cap on said support, said cap being receptive of a horn, a telephone receiver unit in screw threaded engagement with said cap, means to prevent rotation of said unit, and a conical diaphragm in said cap having its apex adjacent the diaphragnii ot said unit, said unit, including its diaphragm being adjustable relative to raid conical diaphragm by rotating said cap.

a'f. A sound amplifier comprising a hollowf dielectric body, a cushion base attached thereto, a revoluble cap on said body, said cap having a. graduated dial and an opening to receive a horn,y a telephone receiver unit having a flange screw threaded into said cap, a cross bar hired in said body below unit, means passing through said bar to prevent rotation of said unit, springs associated with said means to retract said unit, and a conical diaphragn'l in said cap having its apex directed towards said unit.

5. A, sound amplifier comprising a hollow dielectric body, a cushion base attached thereto, a revoluble cap on said body, said cap hai/*ing a graduated dial and an opening` to receive a horn, a' telephone receiver unit having a flange screw threaded into said cap. said flange being perforate, a cross bar in said body, means for anchorinv said bar thereinscrews passing through said bar into said unit flange, compression springs interposed between the heads of said screws and said bar, an inverted conical diaphragm fixed in said cap adjacent the diaphragm of said unit, the distance between the diaphragms being adjustable by rotation of said cap, and means on said cap to facilitate its rotation.

6. A sound amplifier comprising a hollow body, a telephone receiver unit adjustable therein, a dial carrying cap rotatable on said body having screw threaded engagement with said unit, means on said cap to facilitate its manual rotation, means to prevent rotation of said unit, means to create trictional contact of said cap and body, an inverted paper diaphragm in said cap, the

apex of said diaphragm being adjacent the Y diaphragm of said unit, and a base removably engaged to said body. j

7. A. sound ampliiier comprising a hollow body. a telephone receiver unit adjustable therein. a dial carrying cap rotatable on said body, said unit having a perforate flange screw threaded into said can, said cap having an opening to receive a horn` a cross oar anchored in said body below said unit. means guided by said bar to prevent rotation of said unit, an inverted paper diaphragm in said cap adjacent the diaphragm ot said unit, said diaphragme bemutuallv adjustable by rotation of said cap, a cushion cup base on said body and means to secure said base to said bar.

8. A sound amplifier comprising a cham- 1n in@ bered base having upper and lower sections, means to engage a horn in the upper section, a telephone receiver unit adjustably engaged in said base, said unit including a metallic diaphragm, a second diaphragm in the upper section of said base, and a spherical contactor carried at the center of the second named diaphragm adjacent the unit carried diaphragm.

9. A sound amplifier comprising a cha1nbered base having means to engage a horn, a telephone receiver unit adjustably engaged in'said base, said unit including a metallic diaphragm, a diaphragm in the upper portion of said base, a block iixed centrally in the last named diaphragm, and a spherical metallic contactor lixed in said block to eX- tend adjacent the unit carried diaphragm.

10. A sound amplifier comprising a chambered base having means to engage a horn, a telephone receiver unit adj ustably engaged in said base, said unit including a metallic diaphragm, a second diaphragm in the upper portion of said base, blocks extending oppositely outward from the center of said second diaphragm, and metallic spheres set rigidly in the end extremities of said blocks.

ll. In a sound amplifier, the combination with a support, a telephone receiver unit therein, and a rotatable dial, of an inverted conical diaphragm carried by said dial, and means for. adjusting said unit relative to said diaphragm.

l2. In a sound amplifier, the combination with a sectional support and a telephone receiver unit adjustable therein, of a diaphragm .in said support, a spherical contact-or fixed on said diaphragm adjacent said unit and positive means to resiliently regulate the distance between said contactor and said unit.

In testimony whereof I have signed my name to this specification.

EARL H. ROLLIN SON 

